We recently discovered that there are seven different types of breast and now it is revealed that there are eight different types of nipple too.
The various categories were explained to Seventeen by Dr Tsippora Shainhouse, a board-certified dermatologist and pediatrician.
She explained that all off these characteristics are perfectly normal and you may have more than one of them.
However if your nipple changes from inverted to protruding, it may be wise to consult a doctor. Read on to find out which group you fall into:

1. PROTRUDING

Protruding nipples stand out a few millimetres from the surface of the areola (the darker rind of skin around the nipple).
They point outwards and can become hard and pronounced when cold or stimulated.

2. FLAT

A flat nipple does not stand out from the areola, however it can become pronounced when cold or stimulated

3. PUFFY

For a puffy nipple the entire areola is raised, like another mound on top of the breast
The nipple can harden and become more pronounced with cold or stimulation.

4. INVERTED:

Inverted nipples are tucked away inside the skin and not visible
It is sometime possible to bring the nipple out but sometimes the muscles surrounding it are too tight.

5. UNILATERAL INVERTED

A unilateral inverted in when one nipple is raised but another one is inverted and tucked away
This can be a warning sign of breast cancer if your nipples haven't always been like this but have recently changed.
You should see your doctor immediately if this is the case.

6. BUMPY

Sometimes small bumps surround the nipple. They can look like white heads but don't play with them
Sometimes small bumps surround the nipple.
These are actually Montgomery glands. Every woman has the glands, but not everyone can see them and some are bumpier than others.
They can look like white heads and sometimes it is possible to squeeze dead skin cells out of them, but don't mess around with them.

7. HAIRY

Dark hairs growing out of the areola are perfectly normal. They can be fine or coarse but all women have them
Dark hairs growing out of the areola are perfectly normal.
They can be fine or coarse and every woman has them, but some are hairier than others.
It is safe to tweeze out the hairs.

8. SUPERNUMERARY

Supernumery nipples are extra smaller nipples. They can either look like flat moles or raised bumps